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well, looking at it ¬ jumped straight out as a space. Possibly in part because of the way it looks as well as its placement. But that gives a four letter word then a two letter word. Since the four letter word contains the two letter word that rather limits the possibilities.

Then, yes some guess work. since I imagine the text to be something along the lines of "This is my first encrypted message". Too short a fragment to apply frequency analysis really though.

If the world doesn't stop annoying me I will name my kids ";DROP DATABASE;" and get revenge.

Your right... In that instance ¬ is a space but it is a rotating key so each character transposotion has 4 possible shifts (I just gave away how long the key is... LoL)

Very Very true... Frequency analysis would not be useful in this case because the string is so short.

I think the best way to attack cipher text like this is what you are doing already... You got the first to words based of the context of this message. If you were to loke more at word usage and common statements starting with "this is" you will get it

Im pretty sure you can break it, you have a pretty good start already....